FotoFlexer - FotoFlexer is the most powerful online photo editor in existence.

ImBatch - ImBatch is a batch image processor with a nice graphical user interface.

Photoshop.com - Photoshop.

PhotoPenguin App - PhotoPenguin is a completely free batch photo editor with support for cropping, resizing, adding watermarks, and converting photos to other formats. It works on the user's device, using the capabilities of modern browsers.

Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.

Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats